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<p>Elliptic region around an interest point.  
 <a href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#details">More...</a></p>

<p><code>#include &lt;opencv2/xfeatures2d.hpp&gt;</code></p>
<div class="dynheader">
Inheritance diagram for cv::xfeatures2d::Elliptic_KeyPoint:</div>
<div class="dyncontent">
 <div class="center">
  <img src="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.png" usemap="#cv::xfeatures2d::Elliptic_5FKeyPoint_map" alt=""/>
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<area href="../../d2/d29/classcv_1_1KeyPoint.html" title="Data structure for salient point detectors. " alt="cv::KeyPoint" shape="rect" coords="0,0,198,24"/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a93cdc46292806df181169af8703e9cd6"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#a93cdc46292806df181169af8703e9cd6">Elliptic_KeyPoint</a> ()</td></tr>
<tr class="separator:a93cdc46292806df181169af8703e9cd6"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a50a7573985031521a52b3dbaf7048b05"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#a50a7573985031521a52b3dbaf7048b05">Elliptic_KeyPoint</a> (<a class="el" href="../../dc/d84/group__core__basic.html#ga7d080aa40de011e4410bca63385ffe2a">Point2f</a> <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#ae6b87d798d3e181a472b08fa33883abe">pt</a>, float <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a4484e94502486930e94e7391adf9d215">angle</a>, <a class="el" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a> <a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#acc9ec69d02052ee9fc5634c2c2ea4534">axes</a>, float <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a308006c9f963547a8cff61548ddd2ef2">size</a>, float <a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#a5d626241e7fed0fc2e7adaeaa252dbda">si</a>)</td></tr>
<tr class="separator:a50a7573985031521a52b3dbaf7048b05"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:adcc11a54bef1240e3f96680195697309"><td class="memItemLeft" align="right" valign="top">virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#adcc11a54bef1240e3f96680195697309">~Elliptic_KeyPoint</a> ()</td></tr>
<tr class="separator:adcc11a54bef1240e3f96680195697309"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_methods_classcv_1_1KeyPoint"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classcv_1_1KeyPoint')"><img src="../../closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html">cv::KeyPoint</a></td></tr>
<tr class="memitem:a507d41b54805e9ee5042b922e68e4372 inherit pub_methods_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a507d41b54805e9ee5042b922e68e4372">KeyPoint</a> ()</td></tr>
<tr class="memdesc:a507d41b54805e9ee5042b922e68e4372 inherit pub_methods_classcv_1_1KeyPoint"><td class="mdescLeft">&#160;</td><td class="mdescRight">the default constructor  <a href="../../d2/d29/classcv_1_1KeyPoint.html#a507d41b54805e9ee5042b922e68e4372">More...</a><br /></td></tr>
<tr class="separator:a507d41b54805e9ee5042b922e68e4372 inherit pub_methods_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8ce2d246f9dbd4ce3f1539bf40be9533 inherit pub_methods_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a8ce2d246f9dbd4ce3f1539bf40be9533">KeyPoint</a> (<a class="el" href="../../dc/d84/group__core__basic.html#ga7d080aa40de011e4410bca63385ffe2a">Point2f</a> _pt, float _size, float _angle=-1, float _response=0, int _octave=0, int _class_id=-1)</td></tr>
<tr class="separator:a8ce2d246f9dbd4ce3f1539bf40be9533 inherit pub_methods_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2990cc1848eeb189cac9709f04c8f4d3 inherit pub_methods_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a2990cc1848eeb189cac9709f04c8f4d3">KeyPoint</a> (float x, float y, float _size, float _angle=-1, float _response=0, int _octave=0, int _class_id=-1)</td></tr>
<tr class="separator:a2990cc1848eeb189cac9709f04c8f4d3 inherit pub_methods_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac90165a05ac1ffc86a2282299acad922 inherit pub_methods_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">size_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#ac90165a05ac1ffc86a2282299acad922">hash</a> () const</td></tr>
<tr class="separator:ac90165a05ac1ffc86a2282299acad922 inherit pub_methods_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
Public Attributes</h2></td></tr>
<tr class="memitem:acc9ec69d02052ee9fc5634c2c2ea4534"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../d6/d50/classcv_1_1Size__.html">Size_</a>&lt; float &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#acc9ec69d02052ee9fc5634c2c2ea4534">axes</a></td></tr>
<tr class="memdesc:acc9ec69d02052ee9fc5634c2c2ea4534"><td class="mdescLeft">&#160;</td><td class="mdescRight">the lengths of the major and minor ellipse axes  <a href="#acc9ec69d02052ee9fc5634c2c2ea4534">More...</a><br /></td></tr>
<tr class="separator:acc9ec69d02052ee9fc5634c2c2ea4534"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5d626241e7fed0fc2e7adaeaa252dbda"><td class="memItemLeft" align="right" valign="top">float&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#a5d626241e7fed0fc2e7adaeaa252dbda">si</a></td></tr>
<tr class="memdesc:a5d626241e7fed0fc2e7adaeaa252dbda"><td class="mdescLeft">&#160;</td><td class="mdescRight">the integration scale at which the parameters were estimated  <a href="#a5d626241e7fed0fc2e7adaeaa252dbda">More...</a><br /></td></tr>
<tr class="separator:a5d626241e7fed0fc2e7adaeaa252dbda"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a37c3b9b67b41ba9e1306ef19085c0f3a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../dc/d84/group__core__basic.html#gaa52e0258d92b0ff1be1644b061e65f66">Matx23f</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d71/classcv_1_1xfeatures2d_1_1Elliptic__KeyPoint.html#a37c3b9b67b41ba9e1306ef19085c0f3a">transf</a></td></tr>
<tr class="memdesc:a37c3b9b67b41ba9e1306ef19085c0f3a"><td class="mdescLeft">&#160;</td><td class="mdescRight">the transformation between image space and local patch space  <a href="#a37c3b9b67b41ba9e1306ef19085c0f3a">More...</a><br /></td></tr>
<tr class="separator:a37c3b9b67b41ba9e1306ef19085c0f3a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_attribs_classcv_1_1KeyPoint"><td colspan="2" onclick="javascript:toggleInherit('pub_attribs_classcv_1_1KeyPoint')"><img src="../../closed.png" alt="-"/>&#160;Public Attributes inherited from <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html">cv::KeyPoint</a></td></tr>
<tr class="memitem:a4484e94502486930e94e7391adf9d215 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">float&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a4484e94502486930e94e7391adf9d215">angle</a></td></tr>
<tr class="separator:a4484e94502486930e94e7391adf9d215 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aea339bc868102430087b659cd0709c11 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#aea339bc868102430087b659cd0709c11">class_id</a></td></tr>
<tr class="memdesc:aea339bc868102430087b659cd0709c11 inherit pub_attribs_classcv_1_1KeyPoint"><td class="mdescLeft">&#160;</td><td class="mdescRight">object class (if the keypoints need to be clustered by an object they belong to)  <a href="../../d2/d29/classcv_1_1KeyPoint.html#aea339bc868102430087b659cd0709c11">More...</a><br /></td></tr>
<tr class="separator:aea339bc868102430087b659cd0709c11 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aee152750aa98ea54a48196a937197095 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#aee152750aa98ea54a48196a937197095">octave</a></td></tr>
<tr class="memdesc:aee152750aa98ea54a48196a937197095 inherit pub_attribs_classcv_1_1KeyPoint"><td class="mdescLeft">&#160;</td><td class="mdescRight">octave (pyramid layer) from which the keypoint has been extracted  <a href="../../d2/d29/classcv_1_1KeyPoint.html#aee152750aa98ea54a48196a937197095">More...</a><br /></td></tr>
<tr class="separator:aee152750aa98ea54a48196a937197095 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae6b87d798d3e181a472b08fa33883abe inherit pub_attribs_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../dc/d84/group__core__basic.html#ga7d080aa40de011e4410bca63385ffe2a">Point2f</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#ae6b87d798d3e181a472b08fa33883abe">pt</a></td></tr>
<tr class="memdesc:ae6b87d798d3e181a472b08fa33883abe inherit pub_attribs_classcv_1_1KeyPoint"><td class="mdescLeft">&#160;</td><td class="mdescRight">coordinates of the keypoints  <a href="../../d2/d29/classcv_1_1KeyPoint.html#ae6b87d798d3e181a472b08fa33883abe">More...</a><br /></td></tr>
<tr class="separator:ae6b87d798d3e181a472b08fa33883abe inherit pub_attribs_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a1f163ac418c281042e28895b20514360 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">float&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a1f163ac418c281042e28895b20514360">response</a></td></tr>
<tr class="memdesc:a1f163ac418c281042e28895b20514360 inherit pub_attribs_classcv_1_1KeyPoint"><td class="mdescLeft">&#160;</td><td class="mdescRight">the response by which the most strong keypoints have been selected. Can be used for the further sorting or subsampling  <a href="../../d2/d29/classcv_1_1KeyPoint.html#a1f163ac418c281042e28895b20514360">More...</a><br /></td></tr>
<tr class="separator:a1f163ac418c281042e28895b20514360 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a308006c9f963547a8cff61548ddd2ef2 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">float&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a308006c9f963547a8cff61548ddd2ef2">size</a></td></tr>
<tr class="memdesc:a308006c9f963547a8cff61548ddd2ef2 inherit pub_attribs_classcv_1_1KeyPoint"><td class="mdescLeft">&#160;</td><td class="mdescRight">diameter of the meaningful keypoint neighborhood  <a href="../../d2/d29/classcv_1_1KeyPoint.html#a308006c9f963547a8cff61548ddd2ef2">More...</a><br /></td></tr>
<tr class="separator:a308006c9f963547a8cff61548ddd2ef2 inherit pub_attribs_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pub_static_methods_classcv_1_1KeyPoint"><td colspan="2" onclick="javascript:toggleInherit('pub_static_methods_classcv_1_1KeyPoint')"><img src="../../closed.png" alt="-"/>&#160;Static Public Member Functions inherited from <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html">cv::KeyPoint</a></td></tr>
<tr class="memitem:acfcc8e0dd1a634a7583686e18d372237 inherit pub_static_methods_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#acfcc8e0dd1a634a7583686e18d372237">convert</a> (const std::vector&lt; <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html">KeyPoint</a> &gt; &amp;keypoints, std::vector&lt; <a class="el" href="../../dc/d84/group__core__basic.html#ga7d080aa40de011e4410bca63385ffe2a">Point2f</a> &gt; &amp;points2f, const std::vector&lt; int &gt; &amp;keypointIndexes=std::vector&lt; int &gt;())</td></tr>
<tr class="separator:acfcc8e0dd1a634a7583686e18d372237 inherit pub_static_methods_classcv_1_1KeyPoint"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab6a67a0ab17d65a1b28502eba424bfde inherit pub_static_methods_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#ab6a67a0ab17d65a1b28502eba424bfde">convert</a> (const std::vector&lt; <a class="el" href="../../dc/d84/group__core__basic.html#ga7d080aa40de011e4410bca63385ffe2a">Point2f</a> &gt; &amp;points2f, std::vector&lt; <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html">KeyPoint</a> &gt; &amp;keypoints, float <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a308006c9f963547a8cff61548ddd2ef2">size</a>=1, float <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a1f163ac418c281042e28895b20514360">response</a>=1, int <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#aee152750aa98ea54a48196a937197095">octave</a>=0, int <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#aea339bc868102430087b659cd0709c11">class_id</a>=-1)</td></tr>
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<tr class="memitem:a6a56a625fb5fb0df7c63c69ce7713360 inherit pub_static_methods_classcv_1_1KeyPoint"><td class="memItemLeft" align="right" valign="top">static float&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html#a6a56a625fb5fb0df7c63c69ce7713360">overlap</a> (const <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html">KeyPoint</a> &amp;kp1, const <a class="el" href="../../d2/d29/classcv_1_1KeyPoint.html">KeyPoint</a> &amp;kp2)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Elliptic region around an interest point. </p>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a93cdc46292806df181169af8703e9cd6">&#9670;&nbsp;</a></span>Elliptic_KeyPoint() <span class="overload">[1/2]</span></h2>

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          <td class="memname">cv::xfeatures2d::Elliptic_KeyPoint::Elliptic_KeyPoint </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a50a7573985031521a52b3dbaf7048b05">&#9670;&nbsp;</a></span>Elliptic_KeyPoint() <span class="overload">[2/2]</span></h2>

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          <td class="memname">cv::xfeatures2d::Elliptic_KeyPoint::Elliptic_KeyPoint </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="../../dc/d84/group__core__basic.html#ga7d080aa40de011e4410bca63385ffe2a">Point2f</a>&#160;</td>
          <td class="paramname"><em>pt</em>, </td>
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          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>angle</em>, </td>
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          <td class="paramtype"><a class="el" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>&#160;</td>
          <td class="paramname"><em>axes</em>, </td>
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          <td class="paramtype">float&#160;</td>
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          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>si</em>&#160;</td>
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          <td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#adcc11a54bef1240e3f96680195697309">&#9670;&nbsp;</a></span>~Elliptic_KeyPoint()</h2>

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          <td class="memname">virtual cv::xfeatures2d::Elliptic_KeyPoint::~Elliptic_KeyPoint </td>
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<span class="mlabels"><span class="mlabel">virtual</span></span>  </td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#acc9ec69d02052ee9fc5634c2c2ea4534">&#9670;&nbsp;</a></span>axes</h2>

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          <td class="memname"><a class="el" href="../../d6/d50/classcv_1_1Size__.html">Size_</a>&lt;float&gt; cv::xfeatures2d::Elliptic_KeyPoint::axes</td>
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<p>the lengths of the major and minor ellipse axes </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a5d626241e7fed0fc2e7adaeaa252dbda">&#9670;&nbsp;</a></span>si</h2>

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          <td class="memname">float cv::xfeatures2d::Elliptic_KeyPoint::si</td>
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<p>the integration scale at which the parameters were estimated </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a37c3b9b67b41ba9e1306ef19085c0f3a">&#9670;&nbsp;</a></span>transf</h2>

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          <td class="memname"><a class="el" href="../../dc/d84/group__core__basic.html#gaa52e0258d92b0ff1be1644b061e65f66">Matx23f</a> cv::xfeatures2d::Elliptic_KeyPoint::transf</td>
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<p>the transformation between image space and local patch space </p>

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<hr/>The documentation for this class was generated from the following file:<ul>
<li>opencv2/<a class="el" href="../../dc/daa/xfeatures2d_8hpp.html">xfeatures2d.hpp</a></li>
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